How were the Sumerians able to create a surplus of food?

Digging of irrigation canals to irrigate their fields allowed for growing better and more crops. food surpluses allowed people to do other work than farm. this meant that they had enough food to survive in extra to trade with.

Explanation:

Hope this helped Mark BRAINLEST

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )